Its summarized well by the infamous Bush mantra; "Either you are with us, or you're against us".
The US is not so much a nation as it is a set of values, or rather a set of interests. And if you are outside their circle you are simply a foreigner. An alien.
The US own the world, it just got a few "obstacles" currently blocking totally domination. The same way radical islamism see the world as theirs to take. Its their obligation.
Its funny how just one of them gets branded as extremists.